<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 全局为新窗口 -->
    <base target="_blank">
</head>
<body>
    <!-- '_self'覆盖     '_blank' 新窗口 -->
    <a href="https://baidu.com" target="_self">百度</a>
    <a href="https://jd.com" target="_blank" >京东</a>

</body>
</html>